1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #ifndef __ASM_GENERIC_SEMBUF_H 3 #define __ASM_GENERIC_SEMBUF_H 4 5 #include <asm/bitsperlong.h> 6 7 /* 8 * The semid64_ds structure for x86 architecture. 9 * Note extra padding because this structure is passed back and forth 10 * between kernel and user space. 11 * 12 * semid64_ds was originally meant to be architecture specific, but 13 * everyone just ended up making identical copies without specific 14 * optimizations, so we may just as well all use the same one. 15 * 16 * 64 bit architectures typically define a 64 bit __kernel_time_t, 17 * so they do not need the first two padding words. 18 * On big-endian systems, the padding is in the wrong place. 19 * 20 * Pad space is left for: 21 * - 64-bit time_t to solve y2038 problem 22 * - 2 miscellaneous 32-bit values 23 */ 24 struct semid64_ds { 25 struct ipc64_perm sem_perm; /* permissions .. see ipc.h */ 26 __kernel_time_t sem_otime; /* last semop time */ 27 #if __BITS_PER_LONG != 64 28 unsigned long __unused1; 29 #endif 30 __kernel_time_t sem_ctime; /* last change time */ 31 #if __BITS_PER_LONG != 64 32 unsigned long __unused2; 33 #endif 34 unsigned long sem_nsems; /* no. of semaphores in array */ 35 unsigned long __unused3; 36 unsigned long __unused4; 37 }; 38 39 #endif /* __ASM_GENERIC_SEMBUF_H */ 40
